early stage of an embryo produced by cleavage of an ovum a liquid-filled sphere whose wall is composed of a single layer of cells during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
गर्भाशय की दीवार में प्रत्यारोपण (गर्भनिरोधक के आठ दिनों बाद)